instance.fireInvalidated();
}
}
private void configurePorts(Instance instance) {
BitWidth inWidth = instance.getAttributeValue(StdAttr.WIDTH);
int outWidth = computeOutputBits(inWidth.getWidth() - 1);
Port[] ps = new Port[3];
ps[0] = new Port(-20, 20, Port.OUTPUT, BitWidth.ONE);
ps[1] = new Port( 0, 0, Port.OUTPUT, BitWidth.create(outWidth));
ps[2] = new Port(-40, 0, Port.INPUT, inWidth);